Aged components / service!?

Depends.  I can recommend, without reservations, South Florida Speaker Repair (yes, they repair everything, not only speakers) in Lake Worth, FL:

4136 10th Ave N, Lake Worth, FL 33461
Hours: Open ⋅ Closes 5PM
Phone: (561) 968-2360

Especially good on super high-end gear like ARC, etc.  GREAT engineer who knows what he is doing and is fair on prices.

STAY AWAY from Music Technology in Springfield, VA.  THEY charge you for NOT fixing your piece.

Cheers!

For front ends, here in Cali, a well known outfit is George Meyer AV in the Los Angeles area; I seem to recall they are an authorized Mark Levinson, and Krell repair center.  As for other service centers, a good reference is on the V-Cap website, seller of high end audio grade capacitors, where people write about their experiences, and there, writers post the name of the service provider who performed the re-capping service.  And then of course, this forum...  :)

McIntosh lasts a lifetime. I have purchased my main amp MC500 used from 1999, no issues. Others can be restored easily but if it’s within 20 years I wouldn’t worry with Mac and others like arc, Bryson. 

I asked a dealer now, he says 10 year + units and you need to counterweight they would need atleast a see through service sooner than later. I think it seems reasonable that dust etc can be needed to cleaned out. Well, that is pretty much what i figured.

If it ain't broke, don't fix it....thats been my motto.